Update panic-semihosting requirement in /examples/twi-ssd1306 (#459)

Updates the requirements on [panic-semihosting](https://github.com/rust-embedded/cortex-m) to permit the latest version.
- [Release notes](https://github.com/rust-embedded/cortex-m/releases)
- [Changelog](https://github.com/rust-embedded/cortex-m/blob/v0.6.0/CHANGELOG.md)
- [Commits](rust-embedded/cortex-m@v0.5.3...v0.6.0)

---
updated-dependencies:
- dependency-name: panic-semihosting
  dependency-type: direct:production
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

examples/twi-ssd1306/Cargo.toml

@@ -12,7 +12,7 @@ publish = false
 cortex-m-rt = "0.7.0"
 ssd1306 = "0.2.6"
 embedded-graphics = "0.4.7"
-panic-semihosting = "0.5.3"
+panic-semihosting = "0.6.0"
 
 [dependencies.nrf52832-hal]
 path = "../../nrf52832-hal"